An experimental study on the effects of temperature and pressure on negative corona discharge in high-temperature ESPs

Pei Yan, Chenghang Zheng, Weizhuo Zhu, Xi Xu, Xiang Gao, Zhongyang Luo, Mingjiang Ni and Kefa Cen

Applied Energy, 2016, vol. 164, issue C, 28-35

Abstract: High-temperature ESPs are proposed to improve energy efficiency and avoid damage to downstream equipment in integrated gasification combined cycle and pressurized fluidized-bed combustion. In this study, the effects of temperature and pressure on negative corona discharge characteristics were compared. Gas temperature varied from 373K to 1073K, and pressure varied from 30kPa to 100kPa to achieve the same gas density. The additional corona current ΔIt induced by high temperature was calculated, and the additional ion current ΔIi and electron current ΔIe were studied. A wire-type electrode, a spiral electrode, a ribbon electrode, and four gas compositions (N2/CO2/SO2/air) were investigated in the plate-type discharge configuration. Results show that corona current increases more rapidly with increasing gas temperature than that with decreasing pressure at the same gas density. The current density is 0.87mA/m at 973K and atmosphere pressure, which is higher than 0.45mA/m at 30.9kPa and room temperature. An additional temperature effect on corona discharge is proposed apart from the decrease of gas density as temperature increases. ΔIt increases with increasing temperature because of enhanced molecule kinetic energy and ionization rate. The electron-carried current is important at temperatures above 873K. ΔIe/ΔIt increases from 0 to 0.941 when temperature increases from 773K to 973K. Compared with the ΔIt of wire and spiral electrodes, the ΔIt of ribbon electrode is significantly larger because of the enhanced electron avalanche and secondary electron emission. Negative corona discharge does not occur in N2, and corona onset voltages are in the following sequence: CO2>SO2 (6000ppm)>air, which is determined by gas molecule ionization energy. ΔIt/IP is smaller in gas atmosphere with strong electronegativity.

Keywords: High-temperature electrostatic precipitator; Corona discharge; Ion current; Electron current; Gas electronegativity (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0306261915014907
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:164:y:2016:i:c:p:28-35

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2015.11.040

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().